title: Estrus response and fertility after a single cloprostenol treatment in dairy cows with various ovarian structures.
abstract: The objective of this study was to determine rates of estrus and conception in lactating multiparous Holstein cows given 500 μg of cloprostenol intramuscularly after detection of the following ≥ 60 d after parturition: a solid corpus luteum (CL), a CL with a nonechodense cavity ≤ 20 mm in diameter (CLcav), a luteal cyst (cavity > 20 mm in diameter and a luteinized wall > 3 mm in diameter), or a follicular cyst (cavity > 20 mm and a luteinized wall ≤ 3 mm in diameter). The estrus rates were 335/419 (80.0%), 183/223 (82.1%), 170/182 (93.4%), and 44/87 (50.6%), respectively (P < 0.0001), and the conception rates 30 to 36 d after insemination among the estrous cows with an apparently normal mucus discharge were 130/285 (45.6%), 44/141 (31.2%), 39/79 (49.4%), and 19/30 (63.3%), respectively (P < 0.002). Compared with a solid CL, a CLcav did not affect the estrus rate but significantly reduced the conception rate (P < 0.05), and the estrus rates were significantly higher and lower in cows with a luteal or follicular cyst, respectively (P < 0.05).
authors.affiliation: Agri-Industrial Company of Bácsalmás, Hungary (Hatvani); Research Institute for Animal Breeding and Nutrition, Gesztenyés str. 1, Herceghalom, Hungary (Balogh, Gábor); Dennis Gábor Applied University, Budapest, Hungary (Endrődi); Faculty of Veterinary Science, Szent István University, Budapest, Hungary (Abonyi-Tóth); Faculty of Animal Science, University of Kaposvár, Kaposvár, Hungary (Holló); Agriculture and Agri-Food Canada, Lethbridge Research Centre, Lethbridge, Alberta (Kastelic).
authors.forename: Csilla
authors.initials: C
authors.lastname: Hatvani
authors.forename: Orsolya G
authors.initials: OG
authors.lastname: Balogh
authors.forename: Tamás
authors.initials: T
authors.lastname: Endrődi
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Abonyi-Tóth
authors.forename: István
authors.initials: I
authors.lastname: Holló
authors.forename: John P
authors.initials: JP
authors.lastname: Kastelic
authors.forename: György
authors.initials: G
authors.lastname: Gábor
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D016009:Chi-Square Distribution; D003008:Cloprostenol / Q000008:administration & dosage*; D003338:Corpus Luteum / Q000000981:diagnostic imaging / Q000502:physiology*; D004971:Estrus / Q000187:drug effects / Q000502:physiology*; D005260:Female; D007315:Insemination, Artificial / Q000662:veterinary; D008186:Luteolytic Agents / Q000008:administration & dosage*; D049590:Postpartum Period; D011247:Pregnancy; D014463:Ultrasonography
chemical_list: D008186:Luteolytic Agents; D003008:Cloprostenol